header.navbar.navbar-expand.navbar-dark.flex-column.flex-md-row    
  a.navbar-brand.mr-0.mr-md-2(href="/") 豆瓣预告片    
  .navbar-nav-scroll        
    ul.navbar-nav.bd-navbar-nav.flex-row            
      li.nav-item                
        a.nav-link.active(href="/link1") 快捷链接 1
